Your right they didn't preach the gospel of Paul but of Christ. Many Jews were led to Christ at that time. There is no gospel of Paul only the gospel of Christ.https://twitter.com/BWSchank/status/1060528545972260864 …
2 gospels
Gal2:7 But contrariwise, when they saw that t/gospel of t/uncircumcision was committed unto me, as t/gospel of t/circumcision was unto Peter; 8 (For he that wrought effectually in Peter to t/apostleship of t/circumcision, t/same was mighty in me toward tGentiles:)